9915715 has 4 divisors (see below), whose sum is σ = 11898864. Its totient is φ = 7932568.

The previous prime is 9915713. The next prime is 9915721. The reversal of 9915715 is 5175199.

It is a happy number.

9915715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9915715 - 2¹ = 9915713 is a prime.

It is a super-2 number, since 2×9915715² = 196642807922450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9915713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991567 + ... + 991576.

It is an arithmetic number, because the mean of its divisors is an integer number (2974716).

Almost surely, 2^9915715 is an apocalyptic number.

9915715 is a deficient number, since it is larger than the sum of its proper divisors (1983149).

9915715 is a wasteful number, since it uses less digits than its factorization.

9915715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983148.

The product of its digits is 14175, while the sum is 37.

The square root of 9915715 is about 3148.9228316998. The cubic root of 9915715 is about 214.8364720113.

The spelling of 9915715 in words is "nine million, nine hundred fifteen thousand, seven hundred fifteen".